2024 Honda Accord Problems: 4 Issues Every Owner Should Know

2024 model year · 1,603+ owner reports · Updated April 2026

According to Au7o's analysis of 1,603+ owner reports, the 2024 Honda Accord has 4 documented known issues, with 2 rated critical. The most serious are Hybrid Inverter/Power Control Unit (PCU) Cooling System Failure ($100-$6,000 repair) and Hybrid Power Loss While Driving ($0-$0 repair). The most commonly reported issue is Hybrid Inverter/Power Control Unit (PCU) Cooling System Failure with 523 owner reports. Across all issues, repair costs range from $0 to $6,000. DIY maintenance guides at au7o.io.

All 4 Known Issues

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Community Reported

523 owners

On the 2018-2025 Honda Accord 2.0L Hybrid, the 10th and 11th generation Accord Hybrid uses a dedicated liquid-cooled Power Control Unit (PCU/inverter) that manages power flow between the gas engine, electric motors, and high-voltage battery. The PCU cooling system uses a separate small coolant reservoir (distinct from engine coolant) that is often overlooked during maintenance. PCU coolant degradation causes overheating, triggering power reduction/limp mode and IMA system warnings. Honda issued TSB 21-093 addressing PCU coolant replacement intervals. In severe cases, PCU failure leads to complete loss of hybrid function requiring replacement ($3,000-6,000 for PCU module).

This issue also affects: BMW 8 Series, BMW i3, BMW M3

Common Symptoms

Hybrid System Indicator (IMA) warning light
Power reduction or limp mode activation
Reduced fuel economy (10-15% drop)
Vehicle overheating indicator combined with IMA warning
Loss of electric motor assist
Check engine light with hybrid system codes (P1A09, P1AAB)
PCU coolant reservoir level low

How to Fix

Locate and check PCU coolant reservoir (typically near battery/inverter box under hood - separate from engine coolant). Replace PCU coolant with Honda Type 2 Long Life Coolant (Blue) at Honda-specified intervals (every 5 years or 100,000 miles per TSB 21-093). Independent Accord Hybrid forums recommend every 3 years for preventive maintenance. PCU coolant flush: $100-200 at shop, $30-50 DIY. Failed PCU: $3,000-6,000 dealer replacement. Check for hybrid-specific powertrain warranty extension in your state (CARB states: 10yr/150k for high-voltage components).

What Owners Are Using

Parts and tips from 523+ owners who fixed this issue

TipDrive Accord Hybrid owners: Check PCU coolant reservoir level at every oil change - it's a separate reservoir from engine coolant, often overlooked by dealers during service
TipCARB states (CA, CT, MA, NY, etc.) have 10yr/150k warranty on all high-voltage hybrid components including PCU - if within warranty period, Honda must replace PCU for free
UpgradeUse ONLY Honda Long Life Type 2 Coolant (Blue, part #OL999-9011) for PCU cooling system - this is a different formulation from the standard OEM green coolant; do not cross-contaminate (Honda OEM #OL999-9011)
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Typical repair cost:$100 - $6,000

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523+ owners have reported this issue

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Community Reported

High ConfidenceVerified523 reportsLast reported by owners Jan 2025Reviewed Feb 2026

Community Reported

345 owners

On the 2023-2025 Honda Accord, due to a software error, the integrated control module (ICM) central processing unit (CPU) may reset while driving, causing a complete loss of drive power. The supplier did not fully understand component specifications when developing fault detection software, leading to false CPU error detection. Honda recalled over 256,000 Accord Hybrids for this issue.

This issue also affects: BMW 8 Series, BMW i3, BMW M3

Common Symptoms

Sudden loss of drive power while driving
Engine stalling at highway speeds
Warning lights on dashboard
Vehicle unable to accelerate
Potential for vehicle to coast to stop

How to Fix

ICM CPU software reprogramming at Honda dealership (free under recall). Schedule appointment immediately if affected.

What Owners Are Using

Parts and tips from 345+ owners who fixed this issue

NoteThis is a high-severity issue - ignoring it can lead to costly repairs or safety concerns. Address it promptly.
TipGet a proper diagnosis before replacing parts - similar symptoms can have different causes
TipSearch Honda Accord Hybrid forums and owner groups for real-world experiences and DIY guides
TipGet multiple quotes from independent mechanics - dealer prices can be 2-3x higher for the same repair
UpgradeQuality automatic transmission fluid for routine service (Valvoline MaxLife ATF Full Synthetic)
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UpgradeTransmission filter kit with pan gasket for complete fluid service (ATP Transmission Filter Kit)
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UpgradeOBD-II scanner with transmission live data for diagnosing shift issues (BlueDriver Bluetooth Pro OBD2 Scan Tool)
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Typical repair cost:$0 - $0

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345+ owners have reported this issue

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Community Reported

High Confidence345 reportsLast reported by owners Feb 2024Reviewed Feb 2026

Community Reported

423 owners

On the 2023-2025 Honda Accord, the 11th generation Accord (2023+) introduced the updated Honda Sensing 360 system with front radar, front camera, and side cameras. Multiple software bugs affect the system: (1) Lane Centering Assist (LCA) makes abrupt steering corrections, especially near construction zones and highway lane markings. (2) Adaptive Cruise Control (ACC) brakes unnecessarily at overpasses, parked cars, and vehicles in adjacent lanes. (3) The Traffic Jam Assist cuts out unexpectedly. Honda has released several OTA (over-the-air) software updates addressing these issues. Drive Accord members recommend checking for pending software updates at every dealer visit. NHTSA has received complaints relating to false frontal collision warnings.

Common Symptoms

Lane Centering Assist making sudden steering jerks
ACC braking for stationary objects in adjacent lanes or overpasses
Traffic Jam Assist disengaging unexpectedly
FCW (Forward Collision Warning) activating without cause
Lane Departure Warning activating in clear lane
Honda Sensing warning light illuminated

How to Fix

Visit Honda dealer or check Honda Owners app for available OTA software updates to Honda Sensing system - Honda has released multiple calibration updates improving system behavior. Ensure forward camera is clean and not obstructed. Windshield replacement on 11th gen Accord REQUIRES Honda Sensing camera recalibration ($150-300) - non-OEM windshields can cause persistent false warnings. For persistent issues after updates, radar sensor recalibration may be needed ($200-400). File NHTSA complaint at nhtsa.gov for false AEB events to support recall investigation.

What Owners Are Using

Parts and tips from 423+ owners who fixed this issue

TipDrive Accord 11th gen owners: Check Honda Owners app for pending OTA updates at every dealer visit - Honda releases Honda Sensing 360 software updates frequently and they significantly improve system behavior
NoteAfter any windshield replacement, Honda Sensing 360 camera MUST be professionally recalibrated - non-OEM windshields with incorrect glass composition cause permanent false warnings that cannot be calibrated away
TipFor ACC false braking: Many Drive Accord members disable ACC "low-speed follow" and use only highway speeds (45+ mph) where system performs better until Honda improves urban ACC calibration
UpgradeBlueDriver OBD-II scanner — reads ABS, SRS, and engine codes (BlueDriver Bluetooth OBD-II Scanner)
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Typical repair cost:$0 - $400

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423+ owners have reported this issue

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Community Reported

High ConfidenceVerified423 reportsLast reported by owners Feb 2025Reviewed Feb 2026

Community Reported

312 owners

On the 2023-2025 Honda Accord 2.0T, the 11th generation Accord 2.0T (K20C4 engine) inherited the direct-injection carbon buildup issue from the 10th gen. Without port injection to clean intake valves, carbon deposits accumulate on the intake valves and ports starting at 30,000-50,000 miles. The 2.0T engine is more susceptible than the 1.5T because it runs higher combustion temperatures. Additionally, the 11th gen Accord 2.0T reports an unusual idle vibration at cold start that owners describe as a "diesel-like" clatter lasting 2-5 seconds. Honda TSB 23-055 addresses this with an ECM calibration update that adjusts cold start timing.

This issue also affects: Citroën C3, Hyundai Santa Fe, Hyundai Tucson

Common Symptoms

Rough idle or stumbling at cold start
Diesel-like rattling or clatter for first few seconds of cold start
Hesitation or stumbling under light throttle application
Reduced fuel economy after 30,000+ miles
Occasional misfires on cold mornings (P0300-P0304)
Hard cold starts that require extended cranking

How to Fix

For cold start clatter: Visit Honda dealer for ECM calibration update per TSB 23-055 (free under warranty). For carbon buildup: Walnut blast cleaning every 40,000-60,000 miles ($300-500 independent shop). Use top-tier gasoline (Shell V-Power, Chevron, Costco Premium) which contains higher detergent additives. CRC GDI IVD Intake Valve Cleaner (#05319) spray treatment every 10,000 miles slows buildup. Oil catch can installation ($80-150) reduces PCV oil vapor contribution to carbon.

What Owners Are Using

Parts and tips from 312+ owners who fixed this issue

TipDrive Accord 11th gen owners: Request TSB 23-055 ECM update at first service appointment - fixes the cold start diesel clatter that many new owners are concerned about
UpgradeCRC 05319 GDI IVD Intake Valve Cleaner ($30-35) - spray into throttle body while running per instructions every 10,000 miles; Drive Accord forum members with 50k+ miles report notably less buildup with regular use (CRC #05319)
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TipSchedule walnut blast cleaning at 50,000 miles proactively on 2.0T - independent shops ($300-400) provide same service as dealer ($600+). Drive Accord 2.0T owners with high mileage report noticeable power restoration after walnut blast

Typical repair cost:$0 - $500

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312+ owners have reported this issue

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Community Reported

High ConfidenceVerified312 reportsLast reported by owners Feb 2025Reviewed Feb 2026

Frequently Asked Questions

What are the most common Honda Accord problems?

According to Au7o's analysis of 1,603+ owner reports, the 2024-2024 Honda Accord has 4 documented issues. The most frequently reported are: Hybrid Inverter/Power Control Unit (PCU) Cooling System Failure, Hybrid Power Loss While Driving, Honda Sensing 360 - Lane Centering and Adaptive Cruise Control Issues. Of these, 2 are rated critical and should be addressed promptly.

Is the Honda Accord reliable?

The 2024-2024 Honda Accord has 4 known issues documented across 1,603+ owner reports. 2 issues are rated critical: Hybrid Inverter/Power Control Unit (PCU) Cooling System Failure and Hybrid Power Loss While Driving. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Honda Accord problems?

Repair costs for known Honda Accord issues range from $0 to $6,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Hybrid Inverter/Power Control Unit (PCU) Cooling System Failure, typically costs $100-$6,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2018-2025 Honda Accord Hybrid Inverter/Power Control Unit (PCU) Cooling System Failure?

The 10th and 11th generation Accord Hybrid uses a dedicated liquid-cooled Power Control Unit (PCU/inverter) that manages power flow between the gas engine, electric motors, and high-voltage battery. The PCU cooling system uses a separate small coolant reservoir (distinct from eng… Repairs typically run $100-$6,000. Severity: high.

What is the 2023-2025 Honda Accord Hybrid Power Loss While Driving?

Due to a software error, the integrated control module (ICM) central processing unit (CPU) may reset while driving, causing a complete loss of drive power. The supplier did not fully understand component specifications when developing fault detection software, leading to false CP… Repairs typically run $0-$0. Severity: high.

What is the 2023-2025 Honda Accord Honda Sensing 360 - Lane Centering and Adaptive Cruise Control Issues?

The 11th generation Accord (2023+) introduced the updated Honda Sensing 360 system with front radar, front camera, and side cameras. Multiple software bugs affect the system: (1) Lane Centering Assist (LCA) makes abrupt steering corrections, especially near construction zones and… Repairs typically run $0-$400. Severity: medium.

What is the 2023-2025 Honda Accord 11th Gen 2.0T Direct Injection Carbon Buildup and Idle Vibration?

The 11th generation Accord 2.0T (K20C4 engine) inherited the direct-injection carbon buildup issue from the 10th gen. Without port injection to clean intake valves, carbon deposits accumulate on the intake valves and ports starting at 30,000-50,000 miles. The 2.0T engine is more… Repairs typically run $0-$500. Severity: medium.

2024 Honda Accord Problems: 4 Issues Every Owner Should Know

All 4 Known Issues

2018-2025 Honda Accord: Hybrid Inverter/Power Control Unit (PCU) Cooling System Failure#

Common Symptoms

How to Fix

What Owners Are Using

Research This Issue

2023-2025 Honda Accord: Hybrid Power Loss While Driving#

Common Symptoms

How to Fix

What Owners Are Using

Research This Issue

2023-2025 Honda Accord: Honda Sensing 360 - Lane Centering and Adaptive Cruise Control Issues#

Common Symptoms

How to Fix

What Owners Are Using

Research This Issue

2023-2025 Honda Accord: 11th Gen 2.0T Direct Injection Carbon Buildup and Idle Vibration#

Common Symptoms

How to Fix

What Owners Are Using

Research This Issue

Other Honda Models

Frequently Asked Questions

What are the most common Honda Accord problems?

Is the Honda Accord reliable?

How much does it cost to fix common Honda Accord problems?

What is the 2018-2025 Honda Accord Hybrid Inverter/Power Control Unit (PCU) Cooling System Failure?

What is the 2023-2025 Honda Accord Hybrid Power Loss While Driving?

What is the 2023-2025 Honda Accord Honda Sensing 360 - Lane Centering and Adaptive Cruise Control Issues?

What is the 2023-2025 Honda Accord 11th Gen 2.0T Direct Injection Carbon Buildup and Idle Vibration?